Gas-compressing pump for ice-machines



(NoMode1.)'

T. FARNSWORTH;

GAS GOMPRESSING' PUMP FOR ICE MAGHINES.

No. 395,044. Patented Dec. 25, 1888.

I. WIN/E8858:

INVENTOH! ATTORNEY.-

UNITED STATES PATENT OFFICE.

THOMAS FARNSW ORTH, OF SAN ANTONIO, TEXAS.

GAS-COMPRESSING PUMP FOR ICE-MACHINES.

SPECIFICATION forming part of Letters Patent No, 395,044, dated December 25, 1888.

Application filed March 31, 1888. $erial No. 269,128. (No model.)

To aZZ whom it may concern:

Be it known that 1, THOMAS FARNswoRrH, of San Antonio, in the county of Bexar and State of Texas, have invented a new and Improved Gas-Oompressing-Pump for Ice-Machines, of which the following is a full, clear, and exact description.

This invention relates to compressorpumps ot' the class employed in connection with refrigerating-machines, the main objects of the invention being to simplify the construction of the compressor and at the same time increase its eificiency.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar figures of reference indicate corresponding parts in all the views.

Figure 1 is a central sectional elevation of w my improved compressor-pump. Fig. 2 is an inverted plan view of the piston, the lower cap being removed. Fig. 3 is an inverted plan view of the lower cap. Fig. 4 is a central sectional elevation of the piston. Fig. 5 is a central sectional view of the upper portion of the lower valve. Fig. 0 is a corresponding view of the lower portion of the valve. Fig. 7 is a plan view of the upper valve-guide, and l lig. S is a view of a modified construction.

In the drawings, 10 represents a cylinder, in which there is mounted a piston, 11, provided with packingrings 12, which may be arranged in any desired manner, so as to prevent the escape of gas. In the upperend, 13, of the piston is formed a valve-seat, 2, and just below this valve-seat there are guidinglugs ll, between which the valve rides, the upper end of said valve being chamfered, so as to fit against the valve-seat 2.

In the upper section, 3,. of the valve 15 there is formed a hemispherical recess, 4, while the lower part of this upper section is threaded to receive an external thread formed upon the lower section, 5, which lower section has a recess, 6, and a central flaring aperture, 7, through which the piston 16 is passed, the head of the piston being spherical and fitting within the recesses 4 and 6. The valve 15 is normally cushioned by a spring, 17, that is seated upon a shoulder, 18, formed upon the bottom plate, 20, of the piston 11, this bottom plate having a number of apertures, 9, and a number of strengtheningribs, 21, which serve to form a housing for the spring 17.

The cylinder-head 22 is bolted to place in the usual manner, any proper packing being employed to produce a gas-tight joint, and this head is centrally apertured to receive the upper valve-cage, 23, which cage has an annular shoulder, 24, upon which the valve-guide 25 is seated, the stem of the valve 26 riding in a sleeve carried by this guide and the valve being normally held upon its seat 27 by a spring, 28, that is coiled about the sleeve and bears against the under face of the guide and the upper face of the valve proper. The guide and the valve-cage are recessed to receive a rubber packing-ring, 29, while the dischargepipe 30 is recessed to receive a second packing-ring, 31, a flat band or ring, 32, being inserted between the two packing-strips, as described, and the discharge-pipe and the valvecage being united by bolts, as shown, thus producing an air-tight joint.

The operation of the machine is as follows: The expanded gas, returning from the freezing-tank or cooling-chambers, enters the pump at the inlet 40, thus filling the cylinder 10 with gas, which is usually at a pressure of five to twenty pounds. Just as the pistonrod 16 commences to move downward the valve 15 will be drawn from its seat in the piston and engage its bottom plate, 20, to move the piston downwardly, and the gas within the cylinder below the piston will rush through the ports 9 and the spaces between the projections 14, passing thence between the valve and its seat to the space above the piston; but at the commencement of the upstroke the valve 15 will be at once seated, thus preventing any escape of gas from above to a point beneath the piston, and as the valve 15 is so seated the pressure produced by the advancing piston will force the gas be yond the valve 26, through and into a condenser, through the outlet 30.

From the construction above described it will be seen that should the cross-head to which the valve-stem is connected be out of line the piston will not be jammed, owing to the free connection between the parts,

from becoming su1 erheatted and produeing 1 more pressure than is required.

In .l ig. S 1 illustrate a eonstruetion wherein, although the valves operate in the same manner as above described the piston-rod is rigidly emineeted to the valve 15, this eonstruetion being ln'ought about by means of a flanged eollar, 50, plat-ed as shown.

Having thus tull v deseribed my invent ion,

\ 'alve-seat 2 and seeured to the inner or upper end of the piston-rod, substantially as set forth.

The eoinbination, with the e vlinder 10, having inlet at or near its lower end,'a downward-closing valve at its upper end, an openended piston, i1 1, having intm-nal ribs or projeetions, ill, annular valve-seat 2 around its upper open end, and a eentrally-apertured bottom plate, of the valve 15, having vertical movement within the piston and closing upwardly against the valve-seat, said valve be- 1 ing formed ot? the two sections 23 and 5,having I claim as new and desire to seeure by Letters 5 tion having an aperture, '7, eommunieating therewith, and the piston-rod passing through 1 the lower end of the eylinder loosely through Patent- 1. The emuhination, with the Cylinder '10, having an inlet at or near its lower end and a downward-elosing valve at its upper end, of

a piston-rod passing through the lower end of with a ball fitting in the sphericalrecess, substantiallv as set forth, and a spring eushiom the cylinder a, piston 11, open at both ends and having projections or ribs 14 on its inner wall, a valve-seat, 2, around. its upper open end, and a bottom plate, 20, having a central aperture through which the piston-rod of less diameter passes loosely, and the valve 15 1 within the piston closing u p wardl v against the l lmmispherieal recesses l (5, and the lower seethe aperture in bottom plate, so, into the valve and jn'ovided on its inner or upper end ing the valve '15, substantially as set forth.

'lllOMAS l \l'll\'tl\\'()lt'lll. it] 1 esses: llon'r. 'lhALL-YhEl-llit),

Hlvuifnn Hinton. 

